科研之友
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摘要
The boron isotope ratio (delta B-11) of marine biogenic carbonates can reconstruct pH and pCO(2) of seawater, and potentially CO2 concentration in the atmosphere. To date, delta B-11-pHSW calibration has been proposed via culturing experiments, where calcifying organisms are cultured under artificially acidified seawater. However, in scleractinian corals, reconstructed pH values using culture-based calibrations do not agree well with actual observations of seawater CO2 chemistry. Thus, another approach is needed to establish a more reliable calibration method. In this study, we established field-based calibrations for Chichijima and Tahiti, both located in subtropical gyres where surface seawater is close to CO2 equilibrium. We suggest a new approach to calibration of delta B-11-pH in which the long-term delta B-11 variation of massive Porites corals is compared with the decreasing pH trend (i.e., ocean acidification) that has occurred since the Industrial Revolution. This calibration will offer a new avenue for studying seawater CO2 chemistry using coral delta B-11 in diverse settings, such as upwelling regions, coral reefs, and coastal areas.
- 出版日期2015-9
